EN 12845 fire fighting

EN 12845 fire fighting


The Reliability of operation for this fire fighting system controller is not be adversely affected by dust accumulations, variation of temperature, humidity, fungus or adverse  elements. The BE126 is extremely strong and insensitive to vibrations. Basic structure is made of steel and carbon fiber. A NEMA Type 2 drip proof is provided  with an IP54 ingress protection. The Be126 fire fighting controller is suitable for use in locations subject to  high degree of moisture, such as a damp basement or others.



Bernini Design is specialized in design and manufacture of diesel engine fire fighting system controller. The BE126 is a combined automatic and manual diesel engine fire fighting system controller. It meets or exceed the requirements of UNI EN 12845 standard. All devices, such as fire pump alarm and signaling means, are included into Be126 to  ensure maximum performance of the equipment. If your business does include high-tech general purpose diesel driven water pump station you can enable all kind of protective realy. The Be126 will provide an incomparable protection performance. 

EN 12845 Fire Fighting Block Diagram


The Be126 NFPA20 fire pump controller is designed to control and monitor 12 or 24 volt, diesel fire pump engine used in UNI-EN 12845 compliant firefighting application. It features state-of-art multiprocessor structure providing embedded water pressure data logger capable of storing up to 31 days of data. Be126 interfaces with standard or SAE J1939 compatible diesel engines.

This fire pump controller monitors, displays and records all engine information. The Be126 controller automatically starts the diesel engine from water pressure control or non-automatically from manual electric control. It initiates a weekly program test of the system and records analog water pressure measurements. 

The Be126 accepts digital status information from pressure or level switches. It accepts analog 4-20mA or 0-10V analog signal as well. You can connect up to three resistive sensors to monitor the engine parameters if CANbus is not available in your engine. It features RS232 and RS485 serial interfaces. You can connect the Be126 to the Internet via TCP-IP server. The Be126 displays voltage and current of the batteries when you connect MOD-BUS battery chargers. The Be126 monitors the Mains. You can use the Be126 controller in standard diesel engine pump water station by enabling the ‘Engine Protection Mode’.

EN 12845 fire fighting control panel

[12] START PILOT RELAYS.  These LED indicate the status of the start pilot relays START 1 & 2.

[13] HOME BUTTON.  Used to display the 'System Status Page' that contains all basic information.

[14] LAMP TEST & ALARM SILENCE (UNI 12845). To check all lamps and reset the alarm if allowed by the settings.

[15] BATTERY 2 INSTRUMENT: Amper meter of Battery SET2; it provides alarm messages as well.

[16] BATTERY 2 INSTRUMENT: Voltage  meter of Battery SET2; it provides alarm messages as well.

[17] BATTERY 1 INSTRUMENT: Amper meter of Battery SET1; it provides alarm messages as well.

[18] BATTERY 2 INSTRUMENT: Voltage  meter of Battery SET1; it provides alarm messages as well.


[1] ALARMS PANEL. It displays active alarms about engine, battery chargers, fuel & ECU warnings as well.

[2] GRAPHIC DISPLAY. It allows you to program the controller, browse engine instruments, log
event analysis, pressure data logger and so on.

[3] NAVIGATION PUSH BUTTONS. The buttons allow an easy navigation through the various pages.

[4] MENU PUSH BUTTON. It allows you to access directly the menus.

[5] AUTO PUSH BUTTON. It selects the AUTO mode.

[6] TEST PUSH BUTTON. It selects the TEST mode.

[7] OFF PUSH BUTTON. It selects the OFF mode.

[8] MAN PUSH BUTTON. It selects the MANUAL mode.

[9] PRESSURE INDICATOR. It blinks to indicate a drop of water pressure.

[10] START PUSH BUTTONS. Used to start manually the engine.

[11] ENGINE RUNNING LED. It turns on when engine is running.


EN 12845 fire fighting


This is the Be126 recommended wiring diagram that complies with UNI EN 12845 specifications. The Be126 features the re-starting procedure required by the UNI EN 12845.

When the Be126 is in AUTO mode of operation, you have to periodically test the automatic system. Follow the instructions:

  • - Push the [PUMP TEST] button.
  • - The display indicates the message [TEST START].
  • - The Be126 initiates the test by activating the DRAIN VALVE (output JB-5).
  • - The Be126 will start the engine when the sensor detects a drop of pressure (*).
  • - The engine will run for 20 minutes (you have to program the auto shut down).

When you stop the engine, or after the automatic shutdown, the Be126 will activate the external lamp: 'OPERATE MANUAL START TEST BUTTON IF LAMP IS LIT'. You are required to start manually the engine. Once the engine is running, the Be126 will turn off the lamp. We recommend that you consult the sections of the UNI EN 12845 Standard.

(*) Note. If, after a minute time, the pressure fails to drop down, the Be126 will trigger the alarm [TEST START] (see the section 21.0.2 to change the alarm delay if necessary).


The Be126 features a [TEST SCHEDULER] menu that will weekly exercise the diesel engine. You can program a day of the week, hour and minutes to start the engine. You have to program in the same day, hour and minutes to stop the engine. At the programmed date & time, the ‘scheduler routine’ will activate the DRAIN VALVE (output  JB-5) and will display the message [TEST START]. You can program a timeout (see the parameter [TEST FAILURE] that triggers the alarm [TEST FAILURE WARNING] as described in the section 21.0.2 of the user manual). The engine will run for the programmed time and the [EVENT HISTORY] will record all events indicating date & time. The embedded data logger will record all events and the variation of pressure.

EN 12845 fire fighting

MANUAL mode of operation: stopping the engine

To stop the engine you have to push the [OFF] button. The Be126 removes the power to the ‘Fuel Solenoid’ (output JC-8). In case you use an energized to stop solenoid, the Be126 activates the output JC-4 according to [STOP SOLENOID] timing (see the [ENGINE PARAMETERS] sub-menu in section 13.0.5). When you push the [OFF] button, you enter the OFF mode of operation as well. The Be126 clears all alarms and reset the system.

An optional way to stop the engine is to enter the AUTO mode of operation. If there is no fire alarm (all sources of start have been returned to normal) the Be126 will shut down the engine after the [STOP DELAY] timing (see section 21.0.1).

AUTO mode of operation

The Be126 can start the engine at anytime. Do not work on equipment, which is controlled by the Be126. When servicing the engine, disconnect the batteries and battery chargers. We recommend that warning signs be placed on equipment indicating the above. Push the [AUTO] push-button until the yellow AUTO indicator illuminates (connect a lamp to JB-4 output); the display will evidence the message [AUTO]. The engine starts when the Be126 detects one of the following condition:

  • the water pressure switch is open (digital input JF-4)
  • the water level switch is open (digital input JF-7)
  • the water pressure drops below the [START DEMAND] setting.

The yellow indicator >LPS< blinks when the Be126 detects a drop of pressure. The display will switch the message [START DEMAND OFF] to [START DEMAND ON]. The Be126 will initiate the start sequence after a [START DELAY] bypass time. Depending on your settings, the engine will run at idle speed or it will run immediately at nominal speed. When the engine is running, use the display arrows to browse the instruments. If you get lost during navigation, push the [HOME] button: the display will open the ‘System Status Page’ that is the display home page. Based on your settings (NFPA-EN12845 or Engine Protection Mode), the Be126 may stop the engine in AUTO mode of operation when the pressure returns normal. You can stop the engine by pushing the [OFF] button. We remind you that in case you programmed the controller to work according to NFPA 20 specifications, only an OVERSPEED  condition can shut down the engine. All the others alarms provide only a warning . The Be126 will periodically test the engine if the scheduler is correctly programmed. During the test, the display will indicate the message [SCHEDULED TEST] . The engine will stop based on your settings. The [EVENT HISTORY] register records in real-time all sequences. You can browse the event log at any time. When the Be126 is in AUTO mode of operation, you can carry out a test of the automatic system by pushing the [PUMP TEST] button. The Be126 will activate the drain to initiate a test. The sequences are very well described in the ‘TEST mode’ section (see 2.4).

To find out more about AUTO mode of operation, consult the chapter 12 of the NFPA 20 Standard and sections 10.9.7---.13 of the EN 12845 Standard.

When you connect the input JF-10 to battery minus, the Be126 will activate the ‘Engine Protection Mode’ software. If you enable a shutdown (Oil pressure, Temperature, Fuel and so on), the engine will stop accordingly. Automatic START & STOP of the engine are driven by the status of the water pressure or water level. You can program different delays and options to start & stop the diesel engine. The [MISCELLANEOUS] menu  contains the basic settings. The ‘Engine Protection Mode’ will allow you to use Be126 to control and protect diesel engine in water pump station or irrigation systems.



The mode of operation is selected via the [OFF], [MAN] ,and [AUTO] push buttons.When you remove and re-apply the DC supply, the controller enters automatically the OFF mode of operation except when the Be126 was in AUTO mode of operation before shutting down the battery supply.

OFF mode of operation

Push the [OFF] button to enter the OFF mode of operation. You clear all alarms and reset the system. In OFF mode of operation you are allowed to program the controller. You can read the programmed parameters & settings, at any time, not only in OFF mode. To open the main menu, push the [MENU] button. You can browse the list of the sub-menus by using the [ ↑ ] or [ ↓ ] push buttons.

MANUAL mode of operation: starting the engine

  Push the [MAN] button. The display will indicate the message [MANUAL]. Push the [START 1] button if you want to start the engine using the BATTERY SET 1. Push the [START 2] button if you want to use the BATTERY SET 2. Push and hold the button until engine starts. You can program a [CRANK DELAY] and [PREGLOW] prior activating the starter motor. The Be126 terminates the crank according to your settings (see 13.0 & 14.0). In NFPA/EN applications, the Be126 ignores the [PREGLOW] setting. In case the battery voltage drops below 6 volts, the Be126 may reset the software. The controller will restart in OFF mode of operation.

Note for EN 12845

In case of fire, the start push buttons are not inhibited (or start is not terminated) by the ‘Engine Running Status’ . When ‘Engine Protection’ mode is selected (in other words, not in NFPA/EN mode), the Be126 terminates the crank according to your settings.The crank termination parameters, included in the [ENGINE PARAMETERS] menu , are: [CRANK VDC]  [CRANK RPM]  [CRANK CANBUS]. If the engine stops for an unknown reason, the Be126 will trigger the alarm [UNEXPECTED STOP WARNING]. From the MANUAL mode of operation you can enter the AUTO mode of operation by pushing the [AUTO] button at any time. The AUTO mode will automatically control of the entire system.